A process for the removal of nitrous oxide in process off-gas

A nitrous oxide and exhaust gas technology, applied in the fields of nitrous oxide capture, chemical instruments and methods, separation methods, etc.

Pending Publication Date: 2020-11-24
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, carbon monoxide is a poisonous gas, so it is not desirable to be released into the atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0072] Make the temperature 450℃, NOx concentration 285ppm and N 2 The process gas with an O concentration of 1000 ppm passes through a fixed amount of the first monolithic forming catalyst containing iron zeolite. Mix various amounts of ammonia into the gas. The ammonia is mixed into the gas very well by using the static mixer and the long flow distance upstream of the catalytic converter.

[0073] When adding 915ppm ammonia, N 2 The O conversion rate reached 92%, resulting in an ammonia escape of 26.8 ppm. All NOx is removed. The ammonia dose is reduced to obtain an ammonia escape below 2 ppm, which is required by the nitric acid industry, which results in an ammonia dose of 643 ppm. Reduced amount of ammonia leads to reduced N 2 O conversion rate, so that the conversion rate is only 65%. Double the amount of catalyst is still not enough to obtain 92% of N with only 2ppm of ammonia escaped 2 O conversion rate.

[0074] In contrast, after the first catalyst, the second catalys...

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Abstract

Process for the removal of nitrous oxide (N2O) contained in a process off-gas in an axial flow reactor comprising the steps of (a) adding an amount of reducing agent into the process off-gas;(b) in afirst stage passing in axial flow direction the process off-gas admixed with the reducing agent through a first monolithic shaped catalyst active in decomposing nitrous oxide by reaction with the reducing agent to provide a gas with a reduced amount of nitrous oxide and residual amounts of reducing agent; and(c) in a second stage passing the gas with a reduced amount of nitrous oxide and residualamounts of the reducing agent in axial flow direction through a second monolithic shaped catalyst active in oxidation of the residual amounts of the reducing agent.

Description

Technical field [0001] The invention relates to a method for combined removal of nitrogen oxides (nitrous oxide, N 2 O) method. [0002] Background of the invention [0003] N 2 O is a powerful greenhouse gas, so it has CO 2 The region of the market is related to cost. Therefore, N 2 The removal of O needs to be carried out as economically and efficiently as possible. [0004] Nitric acid production is known to have N 2 O-emission industry. Due to the risk of ammonium nitrate formation in the cold spot downstream of the catalytic reactor, the production of nitric acid also has 2 Ammonia (NH 3 ) Escape has very strict requirements. The escape requirement is usually 5 ppm or lower to 3 or even 2 ppm. [0005] N 2 The removal of O needs to be carried out as economically and efficiently as possible. [0006] Nitric acid (HNO 3 ) Is mainly used to make fertilizers and explosives. [0007] Nitric acid is produced according to the Ostwald process of the German chemist Wilhelm Ostwald (Wilhel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8625B01D2251/2062B01D2257/402B01D2257/406B01D2255/50B01D2255/20746B01D2255/20753B01D2255/20761B01D2255/2073B01D2255/20738B01D2255/20792B01D2255/1023B01D2255/502B01D2255/20723B01D2255/1021B01D53/8631B01D53/8634B01D2251/208B01D2255/904B01D2255/9032Y02C20/10B01D53/8628B01D53/90B01D2255/902B01D2255/903B01J23/22B01J23/34B01J23/42B01J23/44B01J23/72B01J29/7615B01J35/0006B01J35/04F01N13/009F01N13/0093
Inventor J·E·明斯特-斯德温森N·B·贾科布森
Owner HALDOR TOPSOE AS
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